Always find your way in the dark with the Fenix Flashlight SD Series. The Fenix SD10 utilizes motion control technology to simplify the user-interface of diving lights. A simple shake of the light is all you need for output selection while the twisty ON/OFF switch is locked to prevent possible flooding by over turning. Powered by one 18650 or two CR123A batteries, this 328 foot/100-meter submersible light puts out 930-lumen neutral white output with 984 feet/300-meter beam distance.